From outside Equipd using the URL Schemes only English is supported for the book names.

But I clicked a link in one of these languages and it did not work?

If you are using these languages and find that the detection of the scriptures fails in specific cases please let me know the scripture, language and the reference location. For example "Chapter 2, Jeremiah Book, Korean - did not detect 2 Cor. 3:14 in para 5" or similar. Then I have all the details I need to zoom in and locate the issue.

How do languages get added to this list?

I manually enable languages for scripture lookup. I have to define a number of things, including all known combinations of the Bible Book name abbreviations for each language - and there can be quite a few abbreviations used for a single book. I then do a number of tests and turn it on the lookups for that language. If you want your language supported then submit a feature request (only if not already added by somebody else!), and try and get others to vote for it so that I can see it will be of value to a number of users.